gaspry.com provides real time gas prices for any US zip code.
When the result appears a visitor can also click the location and view a map of where the gas station is along with viewing a satellite image of the gas station.
In addition all the results are sortable by price, location etc.. If you click the titles at the top of the results it will sort the data.

Revenues come from Google Adsense on the side panel for a nice easy profit.

includes domain, installation and editing of the files with your info.